AIRPORT: have bars but can't connect to internet

In the last week and a half, my MBP's Airport has been really weird lately.
I haven't updated anything aside from iTunes and I think Iphoto.
My airport would say it's connected and that it has full bars, but I can't connect to the internet
This doesn't just happen to my home connection but to my school's connection too.
I've tried creating new Airport by what people told me to do (+/-) etc... and this worked for a while, but then it stopped working OR it would work then drop my connection a couple hours later.
My connection is really bipolar at the moment. It's like one moment, I log on, and I have internet... then the next moment, I don't.
Anyone else having the same problem? Help.

In System Preferences > Network > Airport/Wireless ...
... make certain Airport/Wireless is at the Top of the list. If not, there is a command accessible with the gear Icon under the box to re-order the list and put it there.
To get it to make up its mind more quickly, ask to join new Networks [√]  and on the ( Advanced | Airport/Wireless ) Pane, make sure your Home Network is listed and at the top of the list.
You are not using IPv6, ( Advanced | TCP/IP ) so turn it off.
If it continues to give you trouble, use the ( Assist Me ) button. If "diagnostics" does not give any satisfaction, use "Setup" to set it up again from scratch by answering the questions.

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